Metal-screw machine



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P. CURTIS.

METAL SCREW MACHINE.

No. 265,395. Patented Oct. 3, 1882.

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P. CURTIS. METAL SCREW MACHINE.

No. 265,395. Patented Oct. 3, 1882.

llNiTn STATES PATENT @rrrce.

FRANCIS CURTIS, OF VEST BRATTLEBOROUGH, VERMONT.

METAL-SCREW MACHINE.

SPECIFICATION forming part of Letters Patent No. 265,395, dated October 3, 1882.

Application filed April 4, 1882.

To all whom "it may concern:

Be it known that I, FRANCIS OURTIs, of \Vest Brattleborough, in the county of \Vindham, and in the State of Vermont,have invented certain new and useful Improvements in Machines for Making Metal Screws; and I do hereby declare that the followingis a full,elear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, makinga part of this specification.

This invention relates to certain improvements in machines for making machine-screws; and it has for its objects to provide an improved combination and arrangement of devices whereby the wire from which the screw is to be formed may be fed to the screw-forming devices, the various parts of the screw successively formed, and the screws cutoff, as will be more fully hereinafter described, and'set forth in the claims.

The above-emnnerated objects I accomplish by the machine illustrated in the accompanying drawings, in which- Figure 1 represents a top view of my improved machine; Fig.2, a side elevation thereof; Fig. 3, a longitudinal vertical sectional view on the line 0000 of Fig. 1; Fig. 4, a longitudinal sectional. view of the wire-feeding device enlarged; Fig. 5, a detached view of a portion of the mechanism for advancing and retracting a reciprocating bed which carries a turret or tool-holder. Fig. 6 represents a bot-- tom view ofthe turret-bed. Figs. 7, 8, 9, and 10 represent detached views of the mechanisms for operating the turret and feed devices of the machine; Fig. 11, a detail view of the sleevetube and its attached extensions and springelamp in side elevation.

The letter A indicates the frame of the machine, which is provided with bearings 13, in which is journaled a hollow mandrel, (J. The said mandrel at its forward extremity is inwardly beveled a short distance, as indicated by the letter D in Fig. 4. The forward part of the mandrel has located within it a springchuck,E, theforward end of which is outwardly beveled, as indicated by the letter F, the chuck being formed with a series of elastic jaws by splitting the metal of the chuck longitudinally for a portion of its length. The chuck is ca- (Model) pable of a slight longitudinal movement in the mandrel, and is screw-threaded and inserted in the tubular internally-threaded end of the bifurcated spring arms or legs F the said legs extending to near the rear end of the mandrel.

The letter G indicates a short tube, having a head, L, which is provided with an annular groove, M, for the purpose hereinafter explained. The said tube G at its forward end is provided with longitudinal spring-extensions N N of a length equal to that of the legs or bifurcated spring-arms F the said extensions being adapted to be inserted (with a portion of the tube G) within the mandrel at the rear of the chuck, the extensions occupying the spaces between the said legs.

The tube G, with the exception ofits grooved head, is surrounded by a loose sleeve, P, havin g a head, R, and beveled shoulder V, the forward end of the sleeve sitting loosely in the rear'end of the mandrel, and being capable ofa longitudinal movement therein, and said sleeve being also capable of a .slight longitudinal movement on the tube G, its motion being limited by the head L on said tube and suitable lugs, W, on the extensions N N.

The forward ends of the extensions N N have attached to them a bifurcated tapering springclamp, L, which is adapted to hold the wire or rod from which the screws are to be formed.

The rear ends of the legs F of the chuck are provided with openings Y and the mandrel with openings Z, which openings in the legs and mandrel, respectively, are opposite each other when the chuck is in place.

The letter A indicates two dogs or pawls having bent ends, the forward ends setting through the openings in the mandrel and legs F and being confined therein by means of a screw-collar, A, mounted on the screw-threaded portion B of the mandrel, and having arecess in its forward face, into which the ends of the dogs set, and by the wall of which they are confined. The forward ends of said dogs bear against the headRand shoulderVof the sleeve P, before mentioned, and are operated thereby, as more fully hereinafter specified.

The letter C indicates a lever fulcrumed to a bracket, D, secured to the frame A. The said lever is provided with a swiveled lug, E, which sets in the groove in the head of the sleeve P, the other end of said lever being piw oted to a rod, F, extending back through suitable bearings in the frame to the end of the cam-drum G. The said rod near its free end is recessed, as indicated by the letter H, Fig. 1, so as to be engaged by the reversely-operatiug lugs I and K, and reeiproeated in order to reciprocate the feed devices ofthe mandrel, as more fully hereinafter explained.

The rotatingmandrel is provided with a loose pulley, L, a fast pulley, M, and a double loose pulley, N, by means of which the mandrel is operated through the medium of suitable belts, as more fully hereinafter described. The periphery of the larger portion of the pulley N is about twice the width of that of the pulley M, and it is adapted to be rotated alone by means of a belt running directly upon such broad periphery or in conjunction with the fast pulley M by running the belt on both, the belt being shifted by a belt-shifter, P, to one or both pulleysautomatically, as required. The belt-shifter is secured to the upper end of a le ver, R, fulcrumed to the frame at T. The loose pulley L is driven in an opposite direction from M by means of a narrow belt,which is arranged to be shifted by means of the shifter S to the fast pulley M at the same time the belt of said pulley M is shifted wholly to the pulley N, so as to reverse the rotation of the mandrel, for the purpose more fully hereinaftr r set forth. The shifter S is'secured to the end of a lever, U, which is fulcrumed at V to the frame A. The two levers are operated simultaneously in the proper directions by means of a short can1-lever,\V, fulcru med at Y to the frame A between the respective levers before mentioned, the said lever being connected by means of a longitudinal rod, Z, which is provided with a cam-shaped piece, A, on its rear end adapted to be operated alternately to re eiprocate the rod in opposite directions by means ofthe studs B on the end of the drum G.

The letter (3 indicates a reciprocating bed adapted to move between ways D upon a stationary bed, FF, located on the frame directly in front of and in line with the mandrel. The said reciprocatingbed, near its end opposite the mandrel,isprovided with arotatin g tool-holder or turret, F The said bed on its lower side is provided with an oblique groove, G (see Fig. (5,) in which is adapted to travel a swiveled block, 11*, Fig. 5, secured to the end of an cs eillating lever, 1 the lever on its lower side at the free end being provided with a pin, K which is operated by the cam-lugs T to reciprocate the bed 0 in proper time to act in conjunction with the movements of the mandrel and the feed mechanism.

TheletterL indicates the driving-shaft ofthe machine, which is provided with a pulley, M, which receives motion by means of a belt from loose pulley N, and transmits it to the driving-shaft, from which it is communicated to the cam-drum by a worm and worm-wheel.

The letter P indicates a transverse sliding cutting-tool-carrying bed adapted to travel belt running over the pulleys M N will drive the pulleys in the direction of the arrow in Fig. 1. This will cause the feed mechanism to feed the blank forward. The traveling bed at the same time will be moved toward the wire, so as to carry the threadingdie, which is located in the turret, up on to the wire and cut the screw. When the screw is cut a proper length the broad belt is automatically shifted wholly to the broad pulley and the narrow belt is shifted to the fast pulley, causing the motion of the mandrel to be reversed, the traveling bed being automatically moved back and the die, as it is drawn backward, keeping from the threaded portion of the wire. The transverse cutting-tool is then automatically advanced to the wire and severe the screw.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In combination with the rotary mandrel, the longitudinally movable chuck, and the spring-legs connected therewith,the longitudinally-movable tube and its spring-extensions and spring-clamp, the longitudinally-movable sleeve and the pawls operated thereby, the collar for confining the pawls and the mechanism for operating the same to feed the wire, substantially as specified.

2. In a machine for making screws, the combination of the reciprocating tool-bed having an oblique groove on its under side, an operating-lever, a tool-holder, the transverselymoving cutting-tool-carrying bed, and the operating-lever, and the cam-drum adapted to impart motion synchronously to the said toolbed, substantially as specified.

3. In a machine for making screws, the combination of the rotary mandrel U, the longitudinal movable chuck E, fitting therein, and the feeding-tube G, having spring-extensions M N, the sleeve R, and pawls A, lever G, and reciproeatin g rod F, with the reciprocating bed G2 and its tool-holder F, the transversely-inovable cutting-tool-carrying bed I, and mechanism for operating the whole, consisting of a driving-shaft, U, a rotating cam -drum, G, and intermediate means, substantially as .shown and described, for connecting the drum with and imparting its motion to the respective parts, all arranged to operate for the purpose and in the manner set forth.

In testimony whereofI aifix my signature,in presence of two witnesses, this 20th day of March, 1882.

FRANCIS CURTIS. YVitnesses II. AUBREY ToULMrN, OI'IAS. l). DAVIS. 

